/* ========== Base & Theme ========== */
:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #6b7280;
  --card: #f7f7f8;
  --accent: #1f6feb;
  --accent-weak: rgba(31, 111, 235, 0.12);
  --border: #e5e7eb;
  --success: #10b981;
  --error: #ef4444;
  --input-bg: #ffffff;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
}

html[data-theme='dark'] {
  --bg: #0b0f14;
  --fg: #e5e7eb;
  --muted: #9ca3af;
  --card: #0f1720;
  --accent: #7aa2f7;
  --accent-weak: rgba(122, 162, 247, 0.18);
  --border: #1f2937;
  --success: #34d399;
  --error: #f87171;
  --input-bg: #0c131b;
  --shadow: 0 12px 36px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: 'Roboto', system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 32px 20px 20px;
}

.header {
  text-align: center;
  max-width: 900px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

/* Scoreboard */
.scoreboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 14px;
  width: min(100%, 980px);
}

.score-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
  text-align: center;
}

.score-card .label {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.score-card .value {
  font-size: 24px;
  font-weight: 700;
}

/* Arena */
.arena {
  width: min(100%, 980px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.turn-box {
  width: 100%;
  text-align: center;
}

.turn-title {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.turn-city {
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 700;
}

/* Input row */
.input-row {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 720px;
}

.city-input {
  flex: 1;
  padding: 18px 18px;
  border-radius: 18px;
  border: 2px solid var(--border);
  background: var(--input-bg);
  color: var(--fg);
  font-size: 18px;
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
}

.city-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-weak);
}

/* Buttons */
.btn {
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-weight: 500;
  cursor: pointer;
  transition: transform .08s ease, box-shadow .2s, background .2s, border-color .2s;
  box-shadow: var(--shadow);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: var(--accent);
  color: white;
  border-color: transparent;
}

.btn.primary:hover {
  box-shadow: 0 12px 30px var(--accent-weak);
}

.btn.ghost {
  background: transparent;
}

.controls {
  display: flex;
  gap: 10px;
}

/* Message */
.message {
  min-height: 24px;
  color: var(--muted);
}

/* Rules */
.rules {
  width: 100%;
  max-width: 760px;
}

.rules > summary {
  cursor: pointer;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  user-select: none;
}

.rules[open] > summary {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom: none;
}

.rules-content {
  border: 1px solid var(--border);
  border-top: none;
  padding: 12px 14px 16px;
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
  background: var(--bg);
  color: var(--fg);
}

/* Used list */
.used {
  width: 100%;
  max-width: 760px;
}

.used-title {
  text-align: center;
  color: var(--muted);
  margin-bottom: 8px;
}

.used-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-height: 180px;
  overflow: auto;
  padding: 6px;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
}

.chip {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  font-size: 14px;
}

/* Footer */
.footer {
  text-align: center;
  color: var(--muted);
  margin-top: 8px;
}

/* Feedback colors on input */
.city-input.success {
  border-color: var(--success);
  box-shadow: 0 0 0 6px rgba(16,185,129,0.15);
}

.city-input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 6px rgba(239,68,68,0.15);
}

/* Responsive */
@media (max-width: 720px) {
  .scoreboard {
    grid-template-columns: repeat(2, 1fr);
  }
  .input-row {
    flex-direction: column;
  }
}